古东懂,杨欢,伍文兴,尹健,彭建

• 1:井冈山大学机电工程学院
• 2:重庆大学材料科学与工程学院

摘要(Abstract)：

采用光学显微镜、扫描电镜、万能拉伸试验机等研究了不同预拉伸量(0%、5%、10%)及时效处理对挤压态Mg-4Gd合金组织和力学性能的影响。结果表明：增加预拉伸量会增加时效过程中形成的具有不规则多面体结构及Gd含量相对较低的第二相的数量，其尺寸随时效时间的延长而增加。当预拉伸量从0%增加至5%和10%时，合金的强度不断增加，但增幅逐渐减小，伸长率先迅速下降后趋于稳定。预拉伸处理与时效处理相结合可提高合金的强度但降低了伸长率，其中预拉伸10%合金在峰时效工艺下的屈服强度提高至136.29 MPa、抗拉强度提高至241.48 MPa、伸长率则降低至12.49%。与预拉伸处理相比，时效处理后合金的硬化能力和加工硬化指数值降低。合金的加工硬化率主要受预拉伸工艺的影响，但可通过后续时效处理进行有效控制。

关键词(KeyWords)： Mg-Gd合金;预拉伸处理;时效处理;力学性能;加工硬化

Abstract:

Keywords:

基金项目(Foundation): 江西省教育厅科学技术研究项目(GJJ211038);; 井冈山大学博士科研启动项目(自然科学)(JZB2110);; 国家重点研发计划项目(2021YFB3701100);; 江西省大学生创新创业训练计划项目(S202210419009)

作者(Author): 古东懂,杨欢,伍文兴,尹健,彭建

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